Capitol Hill seems a swamp where partisan throat-grabbing is routine. But peek behind the angry speeches and taunts, and there’s a quiet effort afoot to promote bipartisanship among ambitious up-and-coming interns.

Nasya Blackwell arrived on Capitol Hill in May expecting Democrats and Republicans to constantly be at each others throats, just like it seems on television news shows.

“My perception beforehand was them not being able to agree on a lot of issues or have a willingness to work with each other,” Blackwell recalled. “Now I see something different.”

Instead, Blackwell, a North Carolina Agricultural and Technical State University …